// ============================================================================
//
// Copyright (C) 2006-2007 Dengues
//
// Google Group: http://groups.google.com/group/dengues
// QQ Group: 24885404
//
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public
// License as published by the Free Software Foundation; either
// version 2.1 of the License.
//
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
// Lesser General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
//
// ============================================================================
package org.dengues.designer.ui.database.commands;

import org.dengues.designer.ui.editors.AbstractGEFCommand;
import org.dengues.designer.ui.i18n.Messages;
import org.dengues.model.database.DBColumn;
import org.dengues.model.database.ForeignKey;

/**
 * Qiang.Zhang.Adolf@gmail.com class global comment. Detailled comment <br/>
 * 
 * @since 2007-9-23 上午01:29:38
 */
public class ForeignKeyDeleteCommand extends AbstractGEFCommand {

    private final ForeignKey oldkey;

    private DBColumn oldSource;

    private DBColumn oldTarget;

    /**
     * Qiang.Zhang.Adolf@gmail.com ForeignKeyDeleteCommand constructor comment.
     * 
     * @param castModel
     */
    public ForeignKeyDeleteCommand(ForeignKey castModel) {
        setLabel(Messages.getString("ForeignKeyDeleteCommand.delete.key")); //$NON-NLS-1$
        this.oldkey = castModel;
    }

    /*
     * (non-Javadoc)
     * 
     * @see org.dengues.designer.ui.editors.AbstractGEFCommand#execute()
     */
    @Override
    public void execute() {
        oldSource = this.oldkey.getSource();
        oldSource.setForeignKey(false);
        oldSource.getOutputs().remove(oldkey);
        oldTarget = this.oldkey.getTarget();
        oldTarget.getInputs().remove(oldkey);
    }

    /*
     * (non-Javadoc)
     * 
     * @see org.dengues.designer.ui.editors.AbstractGEFCommand#undo()
     */
    @Override
    public void undo() {
        if (oldSource != null && oldTarget != null) {
            oldSource.getOutputs().add(oldkey);
            oldSource.setForeignKey(true);
            oldTarget.getInputs().add(oldkey);
        }
    }

}
